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      ઘાત અને ઘાતાંક Class 7 GSEB Notes

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      • ઘાત અને ઘાતાંક Class 7 GSEB Notes

      This GSEB Class 7 Maths Notes Chapter 13 ઘાત અને ઘાતાંક covers all the important topics and concepts as mentioned in the chapter.

      ઘાત અને ઘાતાંક Class 7 GSEB Notes

      → 3 × 3 × 3 × 3ને ઘાત સ્વરૂપમાં 34 લખાય.

      → 3માં 3 એ આધાર છે અને 4 એ ઘાતાંક છે. વંચાયઃ ત્રણની ચાર ઘાત

      → 26 નો અર્થ 2 × 2 × 2 × 2 × 2 × 2 = 64

      → જો a અને b એ શૂન્ય સિવાયના પૂર્ણાકો હોય, તથા m અને n પૂર્ણ સંખ્યાઓ હોય તો –

      • am × an = am+n
      • am ÷ an = m-n; m > n
      • (am)n = amn
      • am × bm = (ab)m
      • am ÷ bm = \(\left(\frac{a}{b}\right)^{m}\)
      • a° = 1; a ≠ 0

      GSEB Class 7 Maths Notes Chapter 13 ઘાત અને ઘાતાંક

      → (-1)m જ્યાં m એકી ધન સંખ્યા છે, તો (- 1)m = – 1

      → (-1)n જ્યાં n બેકી ધન સંખ્યા છે, તો (-1)n = 1

      → નીચેના જેવી મોટી સંખ્યાને ઘાતાંકનો ઉપયોગ કરીને ટૂંકમાં નીચે પ્રમાણે લખી શકાય :
      દા.ત.,

      • 80,00,000 = 8 × 106
      • 76,00,00,000 = 76 × 107
      • \(\frac{5}{100000000}\) = 5 × 10-8

      → પ્રમાણિત સ્વરૂપ
      દશાંશ-સંખ્યા જે 1.0 અને 10.0ની વચ્ચે હોય તથા તેનો ગુણક 10ની ! ચોક્કસ ઘાત હોય તેને પ્રમાણિત સ્વરૂપની સંખ્યા કહે છે.
      દા.ત,

      • 15 = 1.5 × 10 = 1.5 × 101
      • 150 = 1.5 × 100 = 1.5 × 102
      • 1500 = 1.5 × 1000 = 1.5 × 103
      • 15,000 = 1.5 × 10,000 = 1.5 × 104……..

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